Spanner or pipe-wrench.



No. 680,742. Patented Aug. 20, 19m.

0. STEWART.

SPMWER 0R PIPE WRENCH.

(Application filed Mar. 15. 1901.)

(No Model.)

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DAVID STElVART, OF GOVAN, SCOTLAND.

SPANNER OR PIPE WRENCH.

SPECIFICATION forming part of Letters Patent No. 680,742, dated August20, 1901. Application filed March 15, 1901. Serial No. 51,256. (Nomodel.)

To all whom it may concern:

Be it known that I, DAVID STEWART, a citizen of the United Kingdom ofGreat Britain and Ireland,residing at 27 Thomson street, Govan,Lanarkshire, Scotland, have invented certain new and useful Improvementsin Spanners or Piperenches, of which the following is a specification.

This invention relates to spanners or pipewrenches; and it has for itsobject to improve the construction of such tools, and particularly inreference to the mechanism for ad justing the jaws of the tool to fitvarious sizes of nuts or pipes.

In the accompanying drawings, which illustrate the invention, Figure 1is an elevation of the improved tool, and Fig. 2 a horizontal section ofthe same on the line a: 00 of Fig. 1. Fig. 3 is an inverted plan of adetail of the ad justing mechanism hereinafter particularly referred to.

The tool consists of an arm or bar A, adapted to be gripped by hand andis of channel form in section, as shown particularly at Fig. 2, for thepurposes hereinafter referred to. This bar A is provided at its upperend with a head B, the upper surface of which is preferably serrated, asshown, and the bar is further formed on one of its flanges withanumher-of worm-teeth O,with which gears a worm D, carried in a slidingbracket or sleeve E, embracing the bar, this sleeve having onthe innersurface of two of its walls projections E, which slide between theflanges of the channel-bar A and serve to guide and take up strain uponthe bracket. The worm D is carried loosely upon a spindle F, pivotedbetween jaws E at the front end of the bracket E, the worm D beingretained upon said spindle between the lower surface of these jaws E andthe upper surface of jaws E into which the lower end of the spindle Fpasses. The lower end of the spindle F is retained in posit-ion withinthe jaws E by means of a clamping device G, pivoted upon the slidingbracket, the clamping device consisting, preferably, of a wire bent asshown at. Fig. 3 and adapted to engage a notch F near the lower end ofthe spindle F. A forked spring H is secured upon the lower edge of thesliding bracket E to normally hold the clamping device Gin engagementwith the notch F. The

sliding sleeve E has also pivoted upon it the outer member I of thespanner or wrench, a spring J on the sleeve E bearing against the innervertical surface of this member in order to retain its head, which isserrated on its under side normally away from the head upon the othermember.

When the spanner or wrench is to be used, the spindle-retaining device Gis depressed, so as to release its forward end from the end of the saidspindle F, the spindle F being thereafter turned upon the pivot at itsupper end in order that the worm may clear the teeth upon the flange ofthe hand-bar A. The bracket E is then moved so as to bringcloser orseparate the grippingsurfaces of the spanner or rod or pipe-wrenchapproximately to the size of the nut or pipe to be turned, the spindle Fbeing thereafter pressed into its position in order that more accurateadj ustment may be made by means of the worm to cause thegripping-surfaces to fit exactly the article to be turned.

An emergency-pin K is or may be pro- Vided on the bracket E, which willretain the spindle F in position should the retainingloop give way, anda stop-pin L is also provided on the upper jaw of the bracket E toprevent the spindle F from being turned so far out when disengaging theworm from the worm-teeth upon the bar A that the worm would drop oifsaid spindle.

Having now described the invention, what I claim, and desire to secureby Letters Patent, is-

1. A spanner or pipe-wrench consisting of a main bar or hand-grip ofchannel form in cross-section, having the usual smooth or serratedgripping-head, and the outer surface of oneof its flanges formed withteeth, a sliding bracket or sleeve embracing the said bar and havingprojections upon it which slide between the flanges thereof, a spindlepivoted at its upper end in jaws in the said sleeve, a worm looselycentered on said spindle, a clamping device consisting of a looped wirepivoted on the sleeve and embracing the lower end of the worm-spindle, aspring bearing on the under side of the looped wire to retain it uponthe end of the spindle, and an outer gripping-head pivoted on thesliding sleeve, and having its gripping-head nor :0 with a clampingdevice consisting of a looped wire pivoted on said sleeve and adapted toengage the lower end of the worm-spindle substantially as and for thepurpose set forth.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

DAVID STEWART.

Witnesses:

WALLACE FAIRWEATHER, JNo. ARMSTRONG, Jr.

